英语翻译尊敬的Sam先生,我向您介绍一下我们中联泵车的开式系统和闭式系统以及它们的优缺点.开式系统：开式循环系统是指液压

英语翻译
尊敬的Sam先生,我向您介绍一下我们中联泵车的开式系统和闭式系统以及它们的优缺点.
开式系统：开式循环系统是指液压泵直接从油箱吸油,高压液压油经换向阀后,驱动主液压缸,回油再经过换向阀回油箱.优点：1）结构较为简单,可以发挥油箱的散热、沉淀杂质作用； （2）压油箱比较大,油泵自吸性能较好,油泵不易吸空；（3）内部也有泄漏,但不用补油.缺点：1）,压力损失较大,能量损耗较高；（2）对整车的冲击力较大,尤其泵车侧向摆动大.（3）液压油常与空气接触,使空气易于渗入系统,易导致机构运动不平稳等后果.
闭式系统：闭式循环系统中主油泵的进、出油口和主油缸直接相连,组成一个封闭的液压油路.优点：（1）目前闭式循环液压系统变量泵均为集成式结构,将补油、溢流、控制等功能阀组与补油泵集成于液压泵上,使管路连接变得简单.提高了系统的可靠性,简化了操作过程；（2）补油系统的排量发生变化高系统的动作频率,还能增加主泵进油口处压力,可有效提高泵的转速和防止泵吸空.（3有效的提高了泵车整车稳定性,工作效率较高.缺点：1）主回路上是没有滤油器的,铁屑或砂粒进入,最终导致泵的配油盘报废；（2）闭式循环液压系统较开式循环液压系统复杂,一般因油箱较小,液压油的散热和过滤条件稍差.

Respect of Sam sir, I to introduce you our vanda pump car off system and close system and their advantages and disadvantages.
Respect of Sam sir, I to introduce you our vanda pump car off system and close system and their advantages and disadvantages.
Open system: open cycle system is a hydraulic pump directly from the fuel tank oil absorption, high pressure hydraulic oil by reversing valves, drive the Lord hydraulic cylinder, return oil again by reversing valves back to tank
Advantages: 1) structure is simple, and can play the tank heat dissipation and precipitation impurities action; (2) pressure tank is bigger, with good performance of self-priming pumps, pump not easy absorption of empty; (3) internal also have leak, but no more oil. Faults: 1), pressure loss bigger, energy loss is higher; (2) the vehicle impact is bigger, especially large lateral wobble pump car. (3) the hydraulic oil often contact with air, which makes air easy infiltration system, easy to institutions such as sports don't smooth consequences.
Close system: closed loop system of main oil pump into or out of oil mouths and Lord oil cylinder composed a closed directly connected, the hydraulic oil. Advantages: (1) currently closed cycle variable pump are hydraulic system is integrated structure, will fill oil, overflow, control function valve group and fill in the hydraulic pump integration, make the pipeline connection become simple. Improve the reliability of system operation process, simplified; (2) fill oil system emissions change of high system, still can increase action frequency master pump JinYou mouth place pressure, which can effectively improve the speed and prevent pump pump suction empty. (3 improves the stability of vehicle pump truck, high work efficiency. Weakness: 1) there is no oil filters on main return, iron or sand into the match, eventually leading to pump oil pan scrap; (2) closed cycle hydraulic systems are more open cycle hydraulic system complex, generally for tank is lesser, hydraulic oil filter conditions of heat and is a bit poor.